Portable lighting device



FIG. 1 is a front perspective view showing the new design, with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is an alternate front perspective view showing the new design, the only difference from FIG. 1 being that the device is shown in a retracted configuration;

FIG. 3 is a top plan view thereof, the bottom plan view, and right and left side elevation views being substantially similar;

FIG. 4 is a front elevation view thereof; and,

FIG. 5 is a rear elevation view thereof. 

The ornamental design for a portable lighting device, as shown and described. 